PSC SP400rf manual RS-232 Feature only, Wack ACK

OPTION 3 — SEND ACK TO THE SCANNER AFTER CTS IS ENABLED FROM THE HOST.

RS-232 FEATURE ONLY.

WACK MODE DISABLED—ACK will be sent immediately, once the radio layer of software detects a valid transmission from the scanner. With WACK Mode disabled, ACK is sent to the scanner regardless of what the interface layer (software) has done or is doing.

WACK MODE ENABLED2—WACK is sent3 once the radio layer (software) validates the message, then ACK is sent to the scanner once the interface layer (software) validates the transmission from the scanner, has sensed the CTS being enabled and has received an ACK from the host (if the interface supports handshaking).

WACK 3

ACK

GENERAL

FEATURES

CTS enabled

WACK MODE RECOMMENDATION

It is recommended that WACK Mode be enabled to ensure the best, most accurate performance. Scanner response will seem quicker when WACK Mode is disabled, however, there is a greater chance that the scanner will erroneously respond with a"Good Read" beep when the host has not received the message, or is not ready for a message. As described in the options above, this is because the interface layer status is not checked to ensure its readiness to receive a message from the radio.

2When WACK mode is enabled, wait time for host acknowledgement is a critical setting. Reference the feature in this section titled "Wait Time for Host Acknowledge".

3In some systems, the ACK response is sent so quickly from the interface that it can override the WACK signal. In this case, the WACK is never perceived by the scanner.

82 SP400RF Programming Guide